Open Acoustica Mixcraft. On a PC, go to "Start" followed by "Programs," "Acoustica" and "Mixcraft." On a Mac, open your "Finder" window and then select the "Applications" tab. Scroll down to "Mixcraft" and double-click on its icon.
Load your audio file by selecting "File" followed by "Open." You will see your multi-track project in Mixcraft. This will have several layers of tracks, each containing different audio files.
Right-click the piece of audio you wish to reverse. Select "Edit in External Editor." This will bring your audio file into a window at the bottom of the program.
Highlight the part of the audio file you wish to reverse. Right-click on it, and then select "Invert." Alternatively, you can use the keyboard shortcut, which is set to Ctrl," "Alt" and "Y" simultaneously.